Add an optimization tutorial for solving point cloud registration

[xipengwang]

[aaron-skydio]

Nice, thanks! I think we might want this as its own tutorial (a separate notebook), rather than part of the optimization one?

[xipengwang]

Sounds good to me. I was looking though all tutorials and wrote some simple examples for practicing. I am not sure if they are useful for general symforce users and worth the efforts to get them in. :)